<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>视觉差</title>
  <link rel="stylesheet" href="./css/2_view.css">
</head>
<body>
  <div class="box_1">
    <br>
    <p class="a">点状轮廓</p>
    <br>
    <p class="b">虚线轮廓</p>
    <br>
    <p class="c">实线轮廓</p>
    <br>
    <p class="d">双线轮廓</p>
    <br>
  </div>
  <div class="box_2"></div>
  <div class="box_3"></div>
</body>
</html>